HUGE_VALF
From cppreference.com
                    
                                        
                    
                    
                                                            
                    |   Defined in header  
<math.h>
  | 
||
|   #define HUGE_VALF /*implementation defined*/ 
 | 
(since C99) | |
|   #define HUGE_VAL  /*implementation defined*/ 
 | 
||
|   #define HUGE_VALL /*implementation defined*/ 
 | 
(since C99) | |
The HUGE_VALF, HUGE_VAL and HUGE_VALL macros expands to a positive floating point constant expression. 
| Constant | Explanation | 
  HUGE_VALF
 | 
Indicates that the value is not representable by the float type (infinity) | 
  HUGE_VAL
 | 
  Indicates that the value is not representable by the double type (infinity). The constant is not necessarily representable as a float  | 
  HUGE_VALL
 | 
  Indicates that the value is not representable by the long double type (infinity). The constant is not necessarily representable as a float or double  |